I don't know whether there's a Windows 8 version, but according to wikipedia, Dev-C++ is still actively developed by Orwell (Johan Mes). Try it here: http://orwelldevcpp.blogspot.com/.
There's even a subreddit for it: http://www.reddit.com/r/devcpp.
I really hope that you aren't using the original Dev-C++, that thing is almost 10 years old and is completely obsolete. As an alternative use Code::Blocks or at least use the Dev-c++ fork
If you are using the original one then you are SOL (no current library will work on it). Else you can take a look to SDL or Cairo to draw stuff.
ohh dev-cpp D:
Unfortunately unless you're using the modern branch you stumbled onto one of the worst C++ IDEs out there.
I'd recommend switching to a different IDE, there are some listed here: http://www.reddit.com/r/learnprogramming/wiki/tools.
Which version of Dev C++ are you trying to install. The latest version is 5.11 (Which is quite old) is here: http://orwelldevcpp.blogspot.com Clicking the download now button will take you to the sourceforge site that lets you download the latest version.
Sorry, I should have specified, I'm using Dev-C++.
Also why should I not simplify? The instructions for this assignment tell me the days should be recalculated after an overloaded prefix and postfix operation.
Why do getDays and getHours need to be const-qualified?
Dev-C++ was actually forked by another developer a few years ago. It's last update was on July 30th.
No idea if OP is using this new Dev-C++ or not, or even how good it is. But at any rate there's something out there called Dev-C++ that isn't old.